Process for preparation of 2-substituted 1,4-naphthoquinone

Details Process for preparation of 2-substituted 1,4-naphthoquinone Process for preparation of 2-substituted 1,4-naphthoquinone

1990-11-28

1994-07-12

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Polycyclo ring system containing anthracene configured ring...

552292, C07C 5018

Patent

active

053290267

ABSTRACT:
A process for preparation of a 2-substituted-1,4-naphthoquinone which comprises oxidizing a 2-substituted naphthalene to obtain reaction products comprising a 2-substituted-1,4-naphthoquinone and a 6-substituted-1,4-naphthoquinone; adding a diene compound to the reaction products and heating the mixture to form a Diels-Alder reaction adduct between the diene compound and the 6-substituted-1,4-naphthoquinone in the reaction products; and separating the 2-substituted-1,4-naphthoquinone from the adduct.

REFERENCES:
patent: 3953482 (1976-04-01), Sugano et al.
patent: 4632782 (1986-12-01), Komatsu et al.
patent: 4639298 (1989-01-01), Kreh et al.
Patent Abstracts of Japan, vol. 10, No. 128 (C-345) (2185) 1986.
Chemical Abstracts, vol. 110, 1989, Abstract No. 23577.

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